The disbelievers will ardently wish that if only they had been Muslims! (At the time of death / in their graves / on the Day of Resurrection.)
ऐसे समय आएँगे जब इनकार करनेवाले कामना करेंगे कि क्या ही अच्छा होता कि हम मुस्लिम (आज्ञाकारी) होते!